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The federal definition of a home energy audit is the cleanest description available of what a useful assessment produces, because it was written to stop people claiming a credit for a sales visit. To qualify, the IRS required the audit to include a written report and inspection that identifies the most significant and cost-effective energy efficiency improvements with respect to the home, including an estimate of the energy and cost savings with respect to such improvement, and to be conducted and prepared by a home energy auditor.

Read that as a specification you can hold a company to whether or not any credit is involved. A written report, not a verbal walkthrough. An inspection, not a questionnaire. Improvements ranked by significance and cost-effectiveness for your house, not a generic list. And an estimate of the energy and cost saving attached to each one, which is the part that separates an assessment from a quote. If a company will not put those four things on paper, it is selling something else.

The physical work behind that report is measurement. A competent assessor reviews a full year of utility bills to establish how the house actually behaves across seasons, walks the envelope from the attic to the crawlspace, depressurises the house with a blower door to find where air is moving, and commonly uses infrared imaging to see where insulation is missing or wet. Combustion appliances get checked for safe operation, because air sealing a house changes how they draft. None of that is optional if the recommendations are going to be worth acting on.

The credit rules also created a checkable credential, and it remains a useful screening question. From 2024, the IRS required the inspection to be conducted by a qualified home energy auditor, defined as an individual certified by one of the qualified certification programs listed by the Department of Energy at the time of the audit, or working under the supervision of a qualified home energy auditor.

The written report carried its own requirements: it had to be prepared and signed by a qualified home energy auditor, be consistent with industry best practices, and include the auditor's name and relevant employer identification number or other appropriate taxpayer identifying number, an attestation that the auditor is certified by a qualified certification program, and the name of that program. The Department of Energy maintains the list of recognised programs, which includes the ASHRAE Building Energy Assessment Professional, the Association of Energy Engineers Certified Energy Auditor and Certified Energy Manager, the Building Performance Institute Building Analyst Professional and Home Energy Professional Energy Auditor, three Building Science Institute credentials, the CalCERTS whole house home energy audit credential, the CHEERS HERS Rater, the Energy Management Association Energy Management Professional, and the RESNET Home Energy Rater.

Two things follow. First, asking which of those certifications the person walking your house holds is a fair and answerable question, and the list is short enough to check. Second, this is a certification rather than a state licence, so in most states it is not a permission to work; it is evidence of training. Where the work that follows is electrical, plumbing or mechanical, the relevant state licence is a separate question.

Because the federal credit shaped so many quotes, the details are worth having straight. The IRS describes the Energy Efficient Home Improvement Credit as equal to 30 percent of certain qualified expenses beginning January 1, 2023, with a maximum annual credit of 1,200 dollars for energy efficient property costs and certain energy efficient home improvements, within which home energy audits were capped at 150 dollars, and a separate maximum of 2,000 dollars a year for qualified heat pumps, water heaters, biomass stoves or biomass boilers. The credit was nonrefundable, meaning it could not exceed the tax owed, and excess could not be carried forward to a later year. The IRS states the credit was allowed for qualifying property placed in service on or after January 1, 2023 and before December 31, 2025.

One line item matters specifically to the electrical side of an energy project and is routinely missed. The IRS states that costs of electrical components needed to support residential energy property, including panelboards, sub-panelboards, branch circuits and feeders, also qualified for the credit if they met the National Electric Code and had a capacity of 200 amps or more, with a limit of 600 dollars per item. That is the clearest signal in the federal rules that upgrading a service was treated as part of an energy project rather than as a separate expense.

The interaction with other money is where sales presentations go wrong most often. The IRS treats public utility subsidies for buying or installing clean energy property as a subtraction from qualified expenses, whether the subsidy reaches you or a contractor on your behalf, while utility payments for clean energy you sell back to the grid do not affect qualified expenses. Rebates are subtracted where they are based on the cost of the property, come from someone connected to the sale such as the manufacturer, distributor, seller or installer, and are not payment for services you provide. State incentives are generally not subtracted unless they qualify as a rebate or purchase-price adjustment under federal law, and the IRS warns that many states label incentives as rebates even though they do not qualify under that definition, which can make them includible in gross income. Separately, the Department of Energy's Home Energy Rebates are now available in select states, and it directs homeowners to their State or Territory Energy Office for the status and eligibility rules where they live.

The sequence is the single most valuable thing an assessment gives you, and it runs in the opposite direction to how these things are usually sold. Reducing the load comes first, because every kilowatt-hour a house does not need is one that never has to be produced, stored, distributed or paid for. Equipment comes second, sized against the reduced load. Generation and storage come last, sized against what is left.

Reversing that order is expensive in a specific and predictable way. Equipment chosen for a leaky house is oversized once the house is sealed, which costs more up front and often runs worse, cycling short and controlling humidity poorly. An array sized against pre-improvement consumption is larger than it needed to be. A battery sized against a pre-improvement load profile is the same mistake with a higher price tag.

There is one honest exception, and it is worth naming because it comes up constantly: emergencies. A failed furnace in February does not wait for an assessment. In that situation the practical compromise is to take advice on sizing before the replacement rather than accepting a like-for-like swap by default, and to schedule the assessment afterwards so the rest of the plan is built around what is now installed.

Energy work is priced on access and on how much of the house is being touched. What moves a number is the size and age of the building, how reachable the attic, walls and crawlspace are, how much air sealing precedes any insulation, whether ventilation has to be added once the house is tighter, the equipment being replaced and whether its distribution is being reworked, whether the service or panel has to grow to carry the plan, whether combustion safety testing and post-work verification are included, and how much of the project is staged over more than one year. A proposal that states what will be measured afterwards is worth more than one that only states what will be installed.

LokalMatch exists to get you in front of the right contractors, nothing more. Describe the house, the bills and what is uncomfortable about it, and companies covering your area receive that description; the ones who want the job contact you directly. Pros pay for the requests they receive, and homeowners are never charged. LokalMatch does not assess houses, install equipment or set prices, and does not vet, rank or recommend anyone, so checking credentials, state licences and any incentive claim against the agency that runs the programme stays with you.